package com.middlegroup.common.utils;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
@Slf4j
public class SpringContextUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext = null;

    /**
     * 非@import显式注入，@Component是必须的，且该类必须与main同包或子包
     若非同包或子包，则需手动import 注入，有没有@Component都一样
     可复制到Test同包测试
     * @param applicationContext
     * @throws BeansException
     */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {

        if (SpringContextUtil.applicationContext == null) {
            SpringContextUtil.applicationContext = applicationContext;
        }

        log.debug("---------------com.middlegroup.common.utils.SpringUtil---------------");

    }


    /**获取applicationContext
     * @return
     */
    public static ApplicationContext getApplicationContext() {

        return applicationContext;

    }


    /**通过name获取 Bean.
     * @param name
     * @return
     */
    public static Object getBean(String name) {

        return getApplicationContext().getBean(name);


    }


    /**通过class获取Bean.
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(Class<T> clazz) {

        return getApplicationContext().getBean(clazz);

    }

    /**通过name,以及Clazz返回指定的Bean
     * @param name
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(String name, Class<T> clazz) {

        return getApplicationContext().getBean(name, clazz);

    }
}